Having powered 835m through marl and gravel, AVN 1800 microtunnel « Magali » successfully finished tunnelling this week.
This curved section is the longest and largest microtunnel in the 9km long CanaMarne project (3km microtunnel, 6km open trenches) which will improve drainage around Paris Charles de Gaulle airport by redirecting rainwater through gravity-flow tunnels to a treatment plant and then to the River Marne.
OPTIMUM initially supported SADE’s project teams for the microtunnel works by defining a precise geotechnical model, design engineering and comprehensive target pressures through the drive. Since construction works began, a dedicated team of OPTIMUM’s trenchless specialists has monitored the microtunnelling operations throughout. Their availability and expertise have ensured :
• boring and slurry systems are constantly adapted to real time ground conditions
• push forces and pressure at the cutting face are appropriate for the geological reality of the site : push force of just 300T after 780m for Magali
Attention now turns to the final crossings.
Project owner : Groupe ADP
Construction contractors : SADE, EHTP, NGE
Trenchless engineering consultancy : OPTIMUM
